I have two .223's with 1:10" twists, a Ruger 77 MKII and a Browning lo wall. THe Ruger isn't real accurate but the Low Wall is damn accurate. But I've never shot them with cast boolets, cause I don't have a mold and can't find off the shelf cast for .22s.
What boolets will shoot well in 1:10 twists? I like cheap Lee molds cause I'm broke.